package com.kuang.pc;

import java.util.PrimitiveIterator;

public class A {
    public static void main(String[] args) {
        Data data = new Data();

        new Thread(()->{
            for (int i=0;i<10;i++){
                try {
                    data.increment();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"A").start();

        new Thread(()->{
            for (int i=0;i<10;i++){
                try {
                    data.decrement();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }

        },"B").start();

        new Thread(()->{
            for (int i=0;i<10;i++){
                try {
                    data.increment();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }

        },"C").start();

        new Thread(()->{
            for (int i=0;i<10;i++){
                try {
                    data.decrement();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }

        },"D").start();

    }
}

class Data {
    private int number = 0;

    public synchronized void increment() throws InterruptedException {
        while (number != 0) {
            this.wait();
        }
        number++;
        System.out.println(Thread.currentThread().getName()+"=>"+number);
        this.notifyAll();
    }

    public synchronized void decrement() throws InterruptedException {
        while (number == 0) {
            this.wait();

        }
        number--;
        System.out.println(Thread.currentThread().getName()+"=>"+number);
        this.notifyAll();
    }
}